Scarifying tooth and holder



March 31, 1936. A. B. WILSON SCARIFYING TOOTH AND HOLDER Filed Aug. 30, 1934 2 Sheets-Sheet 1 March 31, 1936. B, w s

SCAHIFYING TOOTH AND HOLDER 2 Shee ts-Sheet 2 Filed Aug. 50, 1954 A 5. l W/son Patented Mar. 31, 1936 SCARIFYING TOOTH AND HOLDER Arthur B. Wilson, East Lansing, Mich.

Application August 30, 1934, Serial No. 742,085

7 Claims.

This invention relates to a scarifying tooth for road work and a holder therefor. More particularly it relates to a replaceable point for a scarifying tooth and a holder which allows of the ready changing of points while holding the points securely in position during operation.

It is well known that scarifying teeth are worn away very rapidly. In my prior patent on Scarifying tooth, No. 1,859,350, issued May 24, 1932, I provided a construction of a point which madeit possible to wear away a considerable length of a tooth while maintaining the point sufliciently sharp for effective work, but even such a construction wears away quite quickly under the trying conditions of digging up old roads and thus the teeth must be changed frequently.

It is fairly obvious that a considerable saving may be made by discarding only the worn off end of the tooth and so much as is necessary to hold it in place rather than a longer, two-ended tooth, such as has been used frequently in the past. However, it is very difiicult to devise a practical holder which will endura the necessary strain and will hold the tooth in place during its operation and will at the same time release the point readily when it is desired to change the Figure 1 and illustrating how the points may be removed; Fig. 4 is a detail figure disclosing another embodiment of my invention; Fig. 5 is another detail view disclosing still another embodiment of the invention; Figs. 6 and 7 are sectional views on lines 66 and 1-1, respectively, of Fig. 5; Fig. 8 is a detail view of a portion of the construction shown in Fig. 5, viewed from the right of that figure and partly broken away.

In Figure 1 there is shown a carrier beam Iii in which there are mounted a plurality of tooth holders II. In the construction shown each holder II is provided with a slot I2 above beam I and a rod I3 is run through these slots and has thereon wedges 14 so that, when in the position shown in the drawings, the tooth holders are wedged upward to their highest position, as will be explained more fully later. If desired, springs I may be provided upon each of the wedges H, but one spring l5 being shown in the drawings. These springs insure that the holders will be held.

to their highest position even if there are some slight irregularities. This is preferable, although slight ,play in the holder is not serious.

Each holder II has below the beam a head I6 which carries a replaceable tooth H. In the 5 construction shown in Figure 1, the tooth is provided with a front member or plate 20 which does the scarifying and with a plurality of braces 2|, 22 which hold the front plate in position, but are bent back out of the way as the front plate is worn off, as fully described in my prior patent identified above. At the top of the tooth portion of the point, there is a fiange 23 above which a holding portion 24 of the point extents into the head I6. which is provided with a suitable socket 25 therefor.

In the construction shown in Figure 1, this holding portion 24 comprises a front member 26 and a rear member 27 between which the metal is cut away at 28. The metalisneeded at 26 and 21 to hold the point firmly in place and the cut-away portion at 28 is for the sake of lightening the construction. .l I

At the upper end ofmember 26 there is a forwardly projecting lug 29' which rests upon the 7 front 30 of the head I6. Above head IIithere is a clamping member I8 which holds tooth H in V place. This clamping member I 8 is provided with a portion 3| which slides longitudinally of the holder I I and with a wedge member 32 which 30 extends downward at the front of member I I and is adapted to wedge behind the upper portion 33 of lug 29 so that, when clamping member I8 is in the position in which it is shown in Fig. 2, it

securely holds the point in place. A shield 34 35 extends downward from the front of clamping member I8 so as to shield the'joints around'part 29 from the entrance of dirt during the operation of the device. It will be seen from an inspection of Fig. 2 that flange 23 likewise fits against the 40 bottom of head I6 and prevents the entrance of dirt into socket 25 about member 24.

It is quite necessary to provide means for preventing the entrance of dirt into the socket during the operation of the device as otherwise such dirt will become packed into the joints so securely that the removal of the point becomes a matter of extreme difficulty.

It will be readily seen that when it is desired to change the points the member 13 may be moved to the right in the direction of the arrow in Figure 1 which will allow the lowering of holders I I so that clamp I8 may be slipped up with relation to head I6 and release the point. As soon as wedge 32 rises above the upward extension 33 of lug 29, the upper end of the tooth may be swung backwards, as shown in Fig. 3, and the point is readily slipped from the holder and a new one placed in the holder. When all, or as many as desired, of the points have been replaced in this way, the holders Ii are raised so as to bind clamp it between head It and the bottom of beam l0, thus preventing the releasing of the points.

While the manner of raising and lowering the holders II, which has been illustrated, is a convenient and practical way, it is obviously not the only way in which it can be done and any other means for fixing the holders in their elevated position and releasing them, when desired. for removal of the points may be substituted and retain a number of advantages of the invention.

It is quite important, however, that the fastenings which hold the points in place shall be releasable primarily from a point above the bottom of the carrier beam so that the releasing device is not rendered inoperative or difllcultly operative by the contact with dirt to which parts below the beam are subjected.

In the construction just described it will be noted that the point is held in place against the chief force to which it is subjected by portions 26 and 21, and that lug 29 holds it securely against longitudinal movement, but, of course, there is much less force applied in this direction than in a lateral direction. When member ii is lowered, clamp l8 can simply slip upward on that member and release the point, and the joints which constitute this releasing construction are completely protected against the entrance of dirt so that the releasing operation can be very easily accomplished.

In Figs. 4 and 5 there are shown two possible variations which retain some of the advantages of the construction described above. In Fig. 4 the holder II is provided with a modified head I6 adapted to receive the holding portion 24' of a point 11'. The upper end of member 24' is provided on its front side with a notch 36 in which there enters a tooth 31 on clamping member it. The rear of head i6 is provided with a cam 38 against which a cross member 33 at the back of clamp l8 works. It will be readily seen that, when the parts are in the position in which they are shown in Fig. 4, the tooth is firmly held in position and is prevented from longitudinal movement by the tooth 31 which is securely held in notch 36 so long as clamping member i8 is held in the position in which it is shown in that figure. When member H is lowered, it will be seen that the back side of clamp l8 may be raised, as indicated in dotted lines in Fig. 4, and as part 39 slips up cam 38, it allows the forward movement of the clamping member so as to release tooth 31 from notch 36 and allow the removal of a tooth.

In Fig. 5 the construction involves a slight modification of the socket within beam I 0', as shown. The member I l is provided with a modified head I6" on which the point I1" is mounted. In this case the bottom of the holder i6 is provided with a dove-tail groove 40 in which a T-shaped flange 4i on top of point I'I" slides. When in operating position, the tooth is slid back until the upward extension 24" rests against the front of head IS". The upper end of portion 24" terminates in an extension 42 having a head 43 which rests upon lugs 44 extending outward from the front of head I6". This arrangement assists in holding the tooth against longitudinal movement, but, of course, is not absolutely necessary since such longitudinal movement isprevented by the connection 40, 41. A clamping member slides on the ont of the head i6" and in operative position pziss'esfrom in front of extension 42 around lugs 44 and has rear flanges 46 sliding in grooves 41 in head [6.

When holder II is lowered, it will be readily seen that clamping member 45 may be raised so as to allow the point to move forward. When released in this manner, the tooth may be slid forward as indicated by dotted lines in Fig. 5, and this movement may be continued until portion 4! is released from the groove 40 so that the point may be removed.

It will be seen that each of the devices described above has certain features in common. In the first place the tooth is held in position by a clamp which in turn is held in position between a head on member II and the beam. The only thing necessary for the release of the point is the downward movement of holder II which allows' the relative upward movement of the clamping member. Likewise in each case the downward pressure of the beam and head upon the tooth rests upon the upward extension of the tooth and upon the flange of the tooth so that it is not transmitted through the clamping device except as the clamping device rests squarely on the head.

The forms which are shown in Figs. 1 and 4 have the further advantage that they may be readily applied to beams now on the market and in which solid teeth of the old type have been mounted where the downward extending point is worn away until it becomes so blunt as to be no longer'useful and then the tooth is turned over and the other end used in the same way. Thus the new construction shown-in Figs. 1 and 4 may be readily applied to many machines now in use.

While there are certain advantages in the modiilcations shown, it will be readily understood that other changes may be made within the scope of the appended claims while retaining some of the advantages of this invention.

What I claim is:-

1. In scarifying apparatus, a carrier, a holder having a shank slidable vertically in the carrier, and a head below the carrier, a tooth mounted in the head, a clamping member slidable on the shank between the head and carrier securing the tooth in the head when the head is held in its closest position to the carrier and releasing the tooth when the head is lowered, and releasable means to secure the shank in its upper position in the carrier.

2. Apparatus in accordance with claim 1, and in which the last said means is located above the carrier.

3. In scarifying apparatus, a carrier, a holder comprising a shank slidable vertically in the carrier and a head beneath the carrier, there being a downwardly opening socket in the head, a tooth having a securing portion fitted into said socket and a flange around the bottom of said portion and fitting against the bottom of the head around the socket, releasable means for securing the shank in its raised position in the holder, and means, secured in position by the holding of the shank in its upper position, for holding the securing portion of the tooth in the socket.

4. Apparatus in accordance with claim 3, and having said releasable means above the carrier.

5. Apparatus in accordance with claim 3, and having the upper end of said socket opening through the front of the head and the upper end of the securing portion of the tooth hooked onto the lower edge 01' said opening, and the last said means comprising a member slidable upon the shank between the head and the carrier and having a wedge projecting downward back of said opening and a cover plate projecting downward in front of said opening.

6. In road scarifying apparatus, a carrier, a-

shanks in said carrier and securing them releasably in their raised position and for simultaneously releasing them for lowering a limited amount, a tooth in each head, and means holding the teeth in the heads when the shanks are raised and releasing the teeth when the shanks are lowered.

7. Apparatus in accordance with claim 6, and having said raising and lowering means mounted above the carrier.

ARTHUR B. WILSON. 

